A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- Low voltage: a flat battery or corroded terminals
- The battery sensor on the negative terminal or its connector
- The battery was replaced or disconnected and the sensor wasn’t relearned
What you can do yourself
- You can drive: only the automatic engine stop at traffic lights doesn’t work.
- Fix the other codes first. Per GM bulletin 15-NA-087 the battery sensor isn’t replaced: the code is cleared and the sensor relearned with a scanner.
- Check the voltage: with the engine off — at least 12.4 V, with it running — 13.5–14.7 V. If lower, charge the battery and check the alternator.
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
This is the GM meaning (Chevrolet, Cadillac, GMC). On other makes this number means something else: if your car isn’t made by GM, change the make at the top.
Source: GM 15-NA-087 (static.nhtsa.gov)
The explanation comes from the error code reference in the AvtoElektrik PRO app.